What is the actual meaning of hub/shroud offset & how to decrease it
I am performing steady state CFD analysis on turbine blade for which i imported blade model in design modeler & created hot gas flow path through Export point method in which i have to assign the value of hub/shroud offset (i assigned 4.2 % then ansys shows it's ok otherwise show problem in the model), then i generated hot gas flowpath mesh with turbogrid & mesh solid blade & cooling holes (hole filled by fill option in design modeler & assigned cold fluid part)) with ansys 19.1 meshing & then combined send to cfx (as shown in workbench fig.). Analysis worked well (without error, result matched with experimental values with 10% error).
My problem is that in cfx pre , a short portion of blade model is located outside (see cfx pre fig.) the flowpath generated with turbogrid, i think (assume) it's happened due to hub/shroud offset (see green line in design modeler, in my prespective that the portion of blade between the outer green line transferred to turbogrid)
correct me if am wrong about hub/shroud offset & how can i decrease it
Green line left some portion of blade in design modeler (Export point method, 4.2% offset)
Turbogrid(Fluid flow path & mesh generation)
Meshing of solid domain & cooling fluid (hole filled by fill option in design modeler & assigned cold fluid part) in ansys mesh
Combined meshes in cfx pre & boundary conditions applied